Michael Arrington helped make the technology blogosphere a must-read for many. Now, the influential TechCrunch blog founder says the blogosphere is showing its appreciation by encouraging some to abuse him. Arrington announced Wednesday he will take some time off after he was spat on earlier this week as he was leaving a Munich conference. The incident, and his reaction, is renewing more discussion about the level of vitriol on the Internet, the burnout rate of tech bloggers and the sour economy’s impact on the startup company scene.